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Effect of alkaline deep eutectic solvents pretreatment on CH4 yield from anaerobic digestion of corn stover

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  • Sha, Hao
  • Cao, Shengxian
  • Zhao, Bo
  • Dong, Zheng
  • Wang, Gong
  • Duan, Jie

Abstract

Deep eutectic solvents (DES), comprising hydrogen bond donors (HBD) and acceptors (HBA), are gaining prominence in biomass pretreatment due to their excellent lignin depolymerization capabilities. This study explored the impact of alkaline DES pretreatment, specifically focusing on CH4 yield from corn stover anaerobic digestion. Batch experiments were conducted to assess the influence of ethylene glycol (EG) concentration, pretreatment time, and organic loading rate (OLR) on CH4 yield. Results indicated that these factors markedly affected the cumulative CH4 yield. Subsequent optimization using Box-Behnken design (BBD) significantly enhanced the CH4 yield by 1.16 times, achieving the optimal conditions at 0.4 v/v EG concentration, 33.8 min of pretreatment, and 22.2 w/v OLR. Notably, DMER64 and Methanobacterium emerged as the dominant bacterial and archaeal communities, constituting 40.2 % and 71.9 % respectively. Spearman correlation analysis underscored that enhanced substrate accessibility fostered a hydrogen-based, CH4-producing synergistic metabolic pathway. Alkaline DES pretreatment notably resulted in 20.5 % of the carbon flow being directed to CH4, demonstrating its efficacy in converting corn stover into a viable clean energy source and mitigating the environmental impact of agricultural waste.

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  • Sha, Hao & Cao, Shengxian & Zhao, Bo & Dong, Zheng & Wang, Gong & Duan, Jie, 2024. "Effect of alkaline deep eutectic solvents pretreatment on CH4 yield from anaerobic digestion of corn stover," Energy, Elsevier, vol. 302(C).
    • Handle: RePEc:eee:energy:v:302:y:2024:i:c:s0360544224014567
    DOI: 10.1016/j.energy.2024.131683
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    References listed on IDEAS

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